olymmath

HMMT 2006 G9

  • Geometry
  • Answer

Four spheres, each of radius rr, lie inside a regular tetrahedron with side length 1 such that each sphere is tangent to three faces of the tetrahedron and to the other three spheres. Find rr.

Dataset text NuminaMath olympiads. Quoted with source.

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\frac{\sqrt{6}-1}{10}

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